html, body {
    height: 100%;
}

#app{
    display: flex;
    height: 100%;
    width: 100%;
}

#slider{
    flex-basis: 400px;
    background-color: red;
    height: 100%;
}

#main{
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

#top{
    flex-basis: 200px;
    background-color: yellow;
}

#mainContent{
    flex-grow: 1;
    background-color: green;
}
